Home / 12,142.08-18,218.70-7,221.60

Finding the Fourth Proportional to 12,142.08, 18,218.70 and 7,221.60

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Solution

The fourth proportional to 12,142.08, 18,218.70 and 7,221.60 is: 10,835.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,142.08 : 18,218.70 = 7,221.60 : x
  2. Step 2: Convert to fraction form
    12,142.08/18,218.70 = 7,221.60/x
  3. Step 3: Cross multiply
    12,142.08x = 18,218.70 × 7,221.60
  4. Step 4: Simplify right side
    12,142.08x = 131,568,163.92
  5. Step 5: Solve for x
    x = 131,568,163.92/12,142.08
  6. Step 6: Final answer
    x = 10,835.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.